#include<iostream>
using namespace std;
void swap(int &a,int &b)
{
int t=a;
a=b;
b=t;

}
int main()
{
int x=5,y=10;
cout<<"x="<<x<< " y="<<y<<endl;
swap(x,y);
cout<<"x="<<x<< " y="<<y<<endl;
return 0;

}